diff --git a/README.md b/README.md
index 63ca145a..798f6db3 100644
--- a/README.md
+++ b/README.md
@@ -241,6 +241,53 @@ class MailRecipientViewSet(viewsets.ViewSet):
         return Response(serializer.data)
 ```
 
+### OneToOne Relation Nesting
+
+Example of implementing order to client OneToOne relation.
+
+```
+/clients/
+/clients/{pk}/
+/clients/{client_pk}/order/
+/clients/{client_pk}/order/plans/
+/clients/{client_pk}/order/plans/{pk}/
+```
+
+```python
+# seriliazers.py
+
+class ClientsSerializer(HyperlinkedModelSerializer):
+    class Meta:
+        model = Classes
+        fields = ('order_url', ...)
+ 
+
+class OrderSerializer(NestedHyperlinkedModelSerializer):
+    class Meta:
+        model = Orders
+        fields = ('url', 'plans_url', ...)
+
+    parent_lookup_kwargs = { 'client_pk': 'client__pk' }
+
+    url = NestedHyperlinkedIdentityField(
+        view_name='client-order-detail',
+        lookup_field=None,
+        parent_lookup_kwargs=parent_lookup_kwargs
+    )
+
+    plans_url = NestedHyperlinkedIdentityField(
+        view_name='client-order-plans-list',
+        lookup_field=None,
+        parent_lookup_kwargs=parent_lookup_kwargs
+    )
+
+
+class PlansSerializer(NestedHyperlinkedModelSerializer):
+    class Meta:
+        model = Plans
+        fields = (...)
+```
+
 ## Testing
 
 In order to get started with testing, you will need to install [tox](https://tox.readthedocs.io/en/latest/).
diff --git a/rest_framework_nested/relations.py b/rest_framework_nested/relations.py
index 9882c919..1e35611c 100644
--- a/rest_framework_nested/relations.py
+++ b/rest_framework_nested/relations.py
@@ -37,10 +37,13 @@ def get_url(self, obj, view_name, request, format):
         # Unsaved objects will not yet have a valid URL.
         if hasattr(obj, 'pk') and obj.pk in (None, ''):
             return None
-
-        # default lookup from rest_framework.relations.HyperlinkedRelatedField
-        lookup_value = getattr(obj, self.lookup_field)
-        kwargs = {self.lookup_url_kwarg: lookup_value}
+        
+        if self.lookup_field:
+            # default lookup from rest_framework.relations.HyperlinkedRelatedField
+            lookup_value = getattr(obj, self.lookup_field)
+            kwargs = {self.lookup_url_kwarg: lookup_value}
+        else:
+            kwargs = {}
 
         # multi-level lookup
         for parent_lookup_kwarg in list(self.parent_lookup_kwargs.keys()):